added markdown links to issues

CHANGELOG.md

@@ -2,10 +2,10 @@
 
 _Marked as minor release as the behavior of `toJS` has been changed, which might be interpreted both as bug-fix or as breaking change, depending of how you interpreted the docs_
 
-* Fixed #566: Fixed incorrect behavior of `toJS`: `toJS` will now only recurse into observable object, not all objects. The new behavior is now aligned with what is suggested in the docs, but as a result the semantics changed a bit. `toJSlegacy` will be around for a while implementing the old behavior. See [#589](See https://github.com/mobxjs/mobx/pull/589) for more details.
-* Fixed #571: Don't use `instanceof` operator. Should fix issues if MobX is included multiple times in the same bundle.
-* Fixed #576: disallow passing actions directly to `autorun`; as they won't be tracked by @jeffijoe
-* Extending observable objects with other observable (objects) is now explicitly forbidden, fixes #540.
+* Fixed [#566](https://github.com/mobxjs/mobx/pull/566): Fixed incorrect behavior of `toJS`: `toJS` will now only recurse into observable object, not all objects. The new behavior is now aligned with what is suggested in the docs, but as a result the semantics changed a bit. `toJSlegacy` will be around for a while implementing the old behavior. See [#589](See https://github.com/mobxjs/mobx/pull/589) for more details.
+* Fixed [#571](https://github.com/mobxjs/mobx/pull/571): Don't use `instanceof` operator. Should fix issues if MobX is included multiple times in the same bundle.
+* Fixed [#576](https://github.com/mobxjs/mobx/pull/576): disallow passing actions directly to `autorun`; as they won't be tracked by @jeffijoe
+* Extending observable objects with other observable (objects) is now explicitly forbidden, fixes [#540](https://github.com/mobxjs/mobx/pull/540).
 
 # 2.5.2